I hope you all realize that this guy did this all on his profile. When posting comments on your own profile, you can delete the comments without it leaving a message saying "Derp has deleted their comment." Due to this fact, he merely tried a million times, and deleted the failed attempts, and keeping the successul ones. That is why he didn't show any thumbs on the side, because there were no thumbs. It was on a profile, which you cannot thumb. That is also why he did not leave a link.